They are engineered for Subaru EJ-series 4-cylinder engines including EJ20, EJ22 and EJ25 found in various Impreza (WRX/STi), Legacy, Forester and Outback models (examples: GC8, GDB, EJ205/EJ207/EJ255/EJ257 applications). Always verify fitment for your specific year and engine code before purchase.
Forged from SAE 4340 (EN24) chrome-moly steel, multi-stage heat-treated, shot-peened, CNC machined, magnaflux/MP tested and 100% X-rayed/sonic tested for material integrity and fatigue resistance.
Sets include genuine 3/8" ARP 2000 bolts (rated ~220,000 psi). An optional upgrade to ARP L19 bolts (rated ~260,000 psi) is available for an extra cost.
Yes — they are supplied as a complete set sized for Subaru 4-cylinder engines and include ARP 2000 bolts by default. Boltless variants are also offered for customers who prefer to use their own fasteners.
Center-to-center length: 130.5 mm (5.137"). Big end diameter: 55.0 mm. Small end diameter: 23.0 mm. Big and small end widths: 21.38 mm. Big end bores are honed to approximately +/-0.0004" and all bores are finished to +/-0.01 mm.
Sets are balanced and weight-matched to within +/- 1 gram per rod to ensure consistent rotating assembly balance.
Specification lists a nominal rating of 200 HP per rod. For high-horsepower or heavily modified engines you should consider bolt upgrades (ARP L19) and consult a professional engine builder.
Each rod undergoes magnetic particle (magnaflux) inspection, shot peening, 100% X-ray and sonic testing, plus dimensional checks and laser-etch marking for traceability.
A 2-year warranty against manufacturing defects is provided. It typically does not cover damage from improper installation, engine failure due to other components, racing abuse beyond intended use, or normal wear; follow installation instructions and retain proof of purchase.
Yes — bronze wrist pin bushings are fitted to increase wear resistance and extend wrist pin life.
Yes — the H-beam 4340 forged design, heat treatment and testing make them suitable for demanding and turbocharged applications, but confirm overall rotating assembly strength and consider bolt upgrades for very high horsepower builds.
Yes. Although bores are precision-honed, you should verify big-end bore clearances, piston-to-wall and piston-pin clearances, and rod-to-crank journal clearances. A machine shop or experienced engine builder should perform final clearancing and torque procedures.
Follow ARP's torque and/or torque-plus-angle specifications for the supplied bolts. Replace rod bolts if they are reused beyond recommended service life, and always use proper assembly lube and a calibrated torque wrench or angle gauge.
Yes — rods feature a laser-etched maXpeedingrods logo for authenticity. Non-logo products and private/custom logo options are available on request. Titanium-plated upgrade models are also offered.
Yes — while the rods are matched to +/-1 g, a complete rotating assembly balance (including pistons, wrist pins, rings and rods) is recommended when building a high-performance or race engine to minimize vibrations and maximize reliability.
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